【名词&注释】
换热器(heat exchanger)、操作方法(operation method)、报警指示灯
[单选题]曲轴臂距差过大，将导致曲轴产生( )破坏。
A. 弯曲疲劳
B. 扭转疲劳
C. 热疲劳
D. 腐蚀疲劳
查看答案&解析
举一反三：
[单选题]长度小于多少米的帆船在航时，舷灯和尾灯可合并为一盏合色灯＿＿＿＿。B.１２
A. ２０
B. ２５
[单选题]在单元组合式集中监视与报警系统中，开关量报警控制单元给出的报警内容通常包括
A. 控制报警指示灯
B. 控制警报灯和启动备用设备
C. 启动警报和作出相应的处理
D. 输出单元报警信号至延伸报警中心
[单选题]Additives _____ protective layers on metal surfaces guarding them against corrosion.
A. damage
B. form.
C. dissolve
D. contaminate
[单选题]双风管空调系统的优点不包括( )。
A. 可增大送风量
B. 调节时可不影响送风量和室温均匀
C. 可省去末端换热器，方便管理
D. 调节灵敏
[单选题]油水分离器除油效果不佳，在操作方法上如何改进______。
A. 改用间歇工作和适当加温
B. 加温70℃，加快分离
C. 改变水流的脉冲现象
D. 减慢速度
[单选题]In fighting a fire in a fuel tank, the FIRST action you should attempt is to _____.
A. secure all sources of fresh air to the tank
B. begin transferring the fuel to other tanks
C. top off the tank to force out all vapors
D. station someone at the fixed CO2 release controls
[单选题]_________ spanner is this?
A. What
B. How
C. Whose
D. Who
[单选题]Vee-type engines have the connecting rods from two cylinders connected to each _____ of the crankshaft.
A. throw
B. web
C. main bearing
D. deflection
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